Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df04360ad6ff794…

MALICIOUS

PDF

74.6 KB Created: 2021-03-16 11:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ad61c9c5523a76032b7e60f266c4858 SHA-1: 98276d6f67d9b595530c030c86b95fec850f0dc7 SHA-256: 8df04360ad6ff79430784b67a23f8bfaf6a9f5a2ece44ddada19cfad6298187c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=telefone+assistencia+24+horas+bradesco+auto PDF link annotation
    • https://cdn.sqhk.co/jivazufevi/hbhfgeG/basketball_hoop_base_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/giOshfy/78836386422.pdfIn PDF document text
    • https://cdn.sqhk.co/puninuzono/ggegihb/vacation_countdown_app_for_android_free.pdfIn PDF document text
    • http://bazis-rostov.com/art_of_living_programs_listjz4bq.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/msjchGX/easy_buttercream_icing_recipe_for_piping.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/77249269192.pdfIn PDF document text
    • http://jakor.pro/joweninilitokorafezorotisluwjl.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/dogodakugudisusupera.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/v1ujfge/nesitufe.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/diihihi/lego_marvel_superheroes_ps4_cheats_deadpool.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/ihMZYEj/zefasukosalusisivadame.pdfIn PDF document text
    • http://899themes-demo.ru/tuvisuretogewa956yf.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/penuwomigipezumonuv.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/regalame_una_foto_translate_to_english.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/iDihgew/pirates_of_the_caribbean_tow_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/hmzXCgh/windows_games_live_64_bit.pdfIn PDF document text
    • http://urott-hu.com/55379851362b89la.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/ZDIjij5/85624046294.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/g3V8rid/kinenisuxulituwuwije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufojamimusim.atwebpages.com/tagabakororigikilulejulaj.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/69466253116.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 5416 bytes
SHA-256: 4d75bcdfa14f17e587a9d984fcfbfea49bf20db5ad0bdf688f90f33f1dd03e8e
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 13376 bytes
SHA-256: 3deeef4a13a51e515828b45560c89416319680b3edfba71c96533a28f8dd8787

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